Bones act as a frame to which are attached for movement
a. cartilage
b. organs
c. striated muscles
d. cardiac muscles

It's striated muscles. 

Skeletal muscles sometimes also called striated muscle, are attached to bones with the help of tendons. These are also voluntary movement muscles, which allows for your bones and joints to move. . 

Cardiac muscles are  involuntary and strictly found in the heart.

Hopefully this helped and good luck!!!